/Engine/Source/Runtime/PakFile/Public/IPlatformFilePak.h
Given aFPakEntryfrom the index, seek to the payload and read the hash of the payload out of the payload entry Warning: Slow function, do not use in performance critical operations
void ReadHashFromPayload ( const [FPakEntry](API\Runtime\PakFile\FPakEntry) & PakEntry, uint8 * OutBuffer )